Package Instance

Spring MVC and WebFlux applications are vulnerable to Denial of Service attacks when resolving static resources.


More precisely, an application can be vulnerable when all the following are true:

  *  the application is using Spring MVC or Spring WebFlux
  *  the application is serving static resources from the file system
  *  the application is running on a Windows platform


When all the conditions above are met, the attacker can send malicious requests that are slow to resolve and that can keep HTTP connections in use. This can cause a Denial of Service on the application.

Description

In Spring Framework, versions 6.0.x as of 6.0.5, versions 6.1.x and 6.2.x, an application is vulnerable to a reflected file download (RFD) attack when it sets a “Content-Disposition” header with a non-ASCII charset, where the filename attribute is derived from user-supplied input.

Specifically, an application is vulnerable when all the following are true:

  *  The header is prepared with org.springframework.http.ContentDisposition.
  *  The filename is set via ContentDisposition.Builder#filename(String, Charset).
  *  The value for the filename is derived from user-supplied input.
  *  The application does not sanitize the user-supplied input.
  *  The downloaded content of the response is injected with malicious commands by the attacker (see RFD paper reference for details).


An application is not vulnerable if any of the following is true:

  *  The application does not set a “Content-Disposition” response header.
  *  The header is not prepared with org.springframework.http.ContentDisposition.
  *  The filename is set via one of:  *  ContentDisposition.Builder#filename(String), or
  *  ContentDisposition.Builder#filename(String, ASCII)



  *  The filename is not derived from user-supplied input.
  *  The filename is derived from user-supplied input but sanitized by the application.
  *  The attacker cannot inject malicious content in the downloaded content of the response.


Affected Spring Products and VersionsSpring Framework:

  *  6.2.0 - 6.2.7
  *  6.1.0 - 6.1.20
  *  6.0.5 - 6.0.28
  *  Older, unsupported versions are not affected


MitigationUsers of affected versions should upgrade to the corresponding fixed version.

Affected version(s)Fix versionAvailability6.2.x6.2.8OSS6.1.x6.1.21OSS6.0.x6.0.29 Commercial https://enterprise.spring.io/ No further mitigation steps are necessary.


CWE-113 in `Content-Disposition` handling in VMware Spring Framework versions 6.0.5 to 6.2.7 allows remote attackers to launch Reflected File Download (RFD) attacks via unsanitized user input in `ContentDisposition.Builder#filename(String, Charset)` with non-ASCII charsets.

In Spring Framework versions 6.0.15 and 6.1.2, it is possible for a user to provide specially crafted HTTP requests that may cause a denial-of-service (DoS) condition.

Specifically, an application is vulnerable when all of the following are true:

  *  the application uses Spring MVC
  *  Spring Security 6.1.6+ or 6.2.1+ is on the classpath


Typically, Spring Boot applications need the org.springframework.boot:spring-boot-starter-web and org.springframework.boot:spring-boot-starter-security dependencies to meet all conditions.